John m



(N0 Model.)

J. MJCASE.

APPARATUS FOR CASTING HOLLOW GHILLED ROLLS. N0. 275,992. Patented Apr. 17,1883.

NITED STATES JOHN M. CASE, OF COLUMBUS, OHIO, ASSIGNOR TO THE CASE MANUFAC- TURING COMPANY, OF SAME PLACE. v

APPARATUS FOR CASTING HOLLOW CHILL ED ROLLS.

SPECIFICATION forming part of Letters Patent No. 275,992, dated April 17, 1883.

Application filed September 7, 1882. (No model.)

To all whom it may concern Be it known that I, JOHN M. CAsE, acitizen of the United States, residing at Columbus, in the county of Franklin, in the State of Ohio, have invented a newand Improved Apparatus for Casting Hollow Chilled Rolls, of which the following is a specification.

The object of my invention is to produce a hollow chilled roll with smooth and perfect [0 outside surfaces.

In Letters Patent No. 261,999, dated August 1, 1882, for apparatus for casting chilled rolls, 1 described a mold for metals in which I employed a strainer placed within the mold-cavity,

between the gate and the parts of the cavity where smooth or uniform surface or surfaces of the casting are desired, thereby permitting the passage of the strained metal to such parts and the incorporation of the strainer in the casting. In my present improvement Iuse the core'as a strainer, and the small strainingholes form arms which connect the rim with the hub, and the number of arms give sufficient strength to the roll. The strainer,which 2 forms the core in the present invention, is made of sand or other suitable material, and is removed after casting, leaving a hollow roll complete, with strained-metal surface, ready to be turned and finished. By this means I am 0 enabled to make hollow chilled rolls at about one-third the ordinary expense, besides being much better, owing to the fact that they are lighter,and,being hollow, have an inside radiating surface.

In order that my invention may be fully understood, I will proceed to describe it in detail, with reference to the accompanying drawings, in which Figure l is a plan view of the body of the 40 mold containing a roll. Fig. 2 is a vertical longitudinal section of the apparatus with a roll formed around a shaft. Fig. 3 is a perspective view of the core for straining and forming the hollow central portion and radiating arms. Fig. 4 is a perspective View of a core of modified form, which may be used in carrying out the invention.

A represents the hub, and D the outer rim or body, of the cast roll, which are connected by radial arms E,formed by the openings 70 in the cylindrical core K, which core is shown detached in perspective view, Fig. 3.

B represents a shaft, on which the roll may be cast.

MN are respectively the base and cap of the mold, and O the chill-cylinder.

The melted iron is poured in at the hub A through a hole or gate, a, in the cope, and flows thence downward and. outward through the radial openings 70 of the core K, so that the hub A, outer rim or body, D, and arms E constitute one casting, the metal being cast around the shaft B, if desired, or a suitable central opening left to receive the same. After casting, the core may be removed in customary manner.

ltwill be observed that this invention differs from that described in Letters Patent No. 261,999, granted to the Case Manufacturing Company the 1st day of August, 1882, on my application filed the 25th of November, 1881, in the complete formation, in the act of casting, of a hollow roll consisting of two concentric portions, A D, with radial connecting-arms E.

It is not essential that the holes k in the 7 core shall be long, as represented in Figs. 1,

2, and 3, though this is the preferred form. They may be round, square, star-shaped, or of any other preferred form, and also of any size desired. The core may be made, if desired, as

illustrated in Fig. 4, with smaller holes of round or other shape.

I reserve the right to claim in another application the product of the apparatus herein shown and described. 8

Having thus described my invention, the following is what I claim as new and desire to secure by Letters Patent:

The combination, with a mold for metals, of a removable strainer placed within the mold- 9o cavity, between the gate and the parts of the cavity where smooth or uniform surface or surfaces of the casting are desired, thereby permitting the passage of the strained metal to such parts, substantially as shown and de- 5 scribed.

JOHN M. CASE. Witnesses:

OTWAY WATSON, U. E. CANAN. 

